Carbureter.



L. V. FLECHTER.

CARBURETER. APPLICATION FILED APR-24.15MB- RENEWED JANJZE), 1917- 1,233,122, Patented Aug. 28, 1917..

DsTATEs-PA onrion.

LEONARD v. 'l'Lnoi-rrnn, or new YORK, N. YI, Assmnon no I.. v. ELEGHTER a com- PANY, a conrona'rion or new roan.

oansnanrnn.

Speciflcation'of Letters Patent. Patented Aug. 28 1917- Application filed April 24, 1913,,Seria1 Nb. 763,215. Renewed'January 25, 1917. Serial No. 144,550.

To all whom'it may concern:

Be it known that LLEonAnn V. FLncn'rnn, a citizen of the United States, residing at Neiv York, in the borough of -Manhattan of the city of New York, in the State of New York, have invented certain new and useful Improvements in Carburetors, of

which the following is a specification.

This invention relates to. carburetors, particularly such as are used inautomobiles.

In carburetors of this character, an auxiliary air valve is usually provided which opens automatically with increase of suction exerted by the engine as its speed increases. This valve is usually held closed by means of one or more sprin against the resistance of which the va ve opens under the force exerted by the suction of the engine. it is found, however, especially when varying loads are put upon the engine, as when the. automobile is traveling upon a hilly road, thus causing a variation in the speed of the engine, that a fluttering of the valve occurs owing to the change of the degree of suction exerted by the engine. When the suction increases,the valve is aptto open more than is requisite for such increase,thus compressing the springs to an undue extent,

and subsequently when the springs recoil,

the valve is closed to a greater extent than it should be and so the fluttering or oscillation of the valve continues on each sideof the normal position tending to produce an irregular action of the engine and subjecting the sliding surfaces of the valve to undue wear. Y j

The object of this invention is to overcome this difliculty and to this end, I pmvide simple means whereby a certain amount of resistance is offered to any sudden movement'of the valve, thus counteracting any momentary impulse which would-tend to movethe valve farther than is warranted by the speed of the'engine atthe particular moment. Thismeans consists of a dash pot, arranged in a convenient position which ofiers some resistance to any sudden -movement of the valve, but which does not interfere with the automatic adjustment of the valve corresponding to the speed of the engine. The dash pot is disposed in an extension of the adjustable valve bushing, the

moving portion or plunger of the dash pot le i jjl' an annular flange or head formed on the sleeve extending From the valve and sliding upon a stem which adjusts the rela-; tive pos t ons ofthe springs. As located in thls position,- the dashfpot is concealed, is

vention.

The carbureter'is supplied with fuel in the usual manner, as by a tube leading to the nipple 1, which isfscrewedinto the easing of the float chamber 2, in which is contained a float 3, maintaining the fuel in the float chamber at a substantially con- The figure-is. a longitudinal'fsectional ole-- vation of a carbureter cnibodying'myjm stant level through the instrumentality. of."

a lever 4, operating a needle valve.,5, extending into the openingof the nipple. A fuel spraying nozzle 6 communicates with the float chamber through a passage 7 and is,

dis osed within the usual Venturi tube 8,

in 0 which air is. admitted through an aper- 1 tured cup 9 attached to the-bottom of the tube.- I

,through the bushing which'ertends above the head and below the valve, and is pro-- vided near its top with a knurled nut'17 slidably mounted on the stem, which is threaded in the head 15 so that it may be rotated by said nut to adjust same. Said nut is normally held in position by a spring '18 bearing against it to force the projections 19 formed on the nut into corresponding grooves formed on the top of the head. ,The bottom of'thestem is provided with a if bearing 20 for an auxiliary resistance spring 21 normally spaced a slight distance from An auxiliary air inlet is provided through I the bottom of the valve. A primary resist- V ance spring 22 seating onthe casing, normally holds the valve to its seat onthe bushing. p I

When the speed of the engine rises to a point where the main air supply is inadequate, the auxiliary valve opens to a-degree proportional to the increase ofgthe suction at such speed against the tension of the springs .21 and 22, which are adjustable reets or recesses 27 provided in the bushing.

In order to prevent fluttering or oscillation of the auxiliary valve, the head 15 is provided with an annular chamber 28, concentric with the bushing 10 and the valve 12. and forming a dash pot. The plunger 2 of said dash pot fits snngly therein and is slidably mounted upon and guided by the stem 16. Said plunger is operatively connected with the -valve 12, preferably by means of a tubular extension 30 inclosing the stem and formed integral with the valve. Preferably the plunger constitutes a flange on said tubular extension, so that a rigid connection is provided between the valve and the plunger, having a relatively long bearing on the stem which prevents any tilting or lateral movement of either the plunger or the valve. The plunger fits the inner wall of the dash pot snugly, and .thus gives the resistance necessary to obtain gradual movement of the valve and prevent fluttering or rapid pulsation thereof.

By means of this construction, the dash pot can be arranged immediately above the valve and concentric therewith. The stem which supports and guides the springs below the valve also guides the plunger, A compact, economical construction is thus obtained, whichis also simple, eilicieiit and reliable in operation.

I claim' as my invention 4.

1. In a carbureter, thefcombination with a casing, of an adjustable bushing mounted in said casing and having a valve seat forming an air. inlet, a valve controlling the inlet and seating on thevalve seat a head .imvmg a chamber to form a dash-pot, oriiieed walls connecting the head and valve seat in mutually fixed relation, said bushing, head and walls constituting a unitary structure, a plunger slidably engaging the dashpot, a relatively long tubular stem rigidly connecting the plunger and valve, a rod secured in the head and passing through the stem to form a. guide for the valve and pluncomprising a spring 26 mounted in the casger, and to prevent tilting thereof; the portions of said rod within the tubular stem having a smooth surface and a spring in the casing bearing ou'the valve for yieldingly opposing the opening thereof and adapted to be adjusted to vary its tension when the bushing is adjusted.

2. In a carbureter, the combination with a casing of an adjustable bushing having a valve seat in. said casing to form an air inlet, a valve adapted to engage said seat to close the inlet, a head having a'chamber to form a dash-pot, orificed Walls connecting the head and bushing in mutually fixed relation, a plunger slidably engaging the dash- .pot, a tubular stem rigidly connecting the plunger and valve, a rod secured in the head passing through the stem to form a relatively long guide for the valve and plunger, a spring in the casingbearing on-the valve for yieldingly opposing the opening thereof and adapted to be adjusted to vary its tension by the adjustment of the combined bushing, head and orificed walls, a spring on the end of the rod within the casing normally spaced from the valve and means for varying the space between the said spaced spring and valve.

3. In a carbureter, the combination with a casinghaving a main air inlet, of an adjustable bushing in said casing forming an auxiliary inlet and provided with a valve seat, a head formed integral with said bushing and provided with an annular recess seat, a valve adapted to engage said seat to close the auxiliary air inlet, a plunger slidably mounted in the dash-pot, a tubular extension connecting, the valve and plunger and a stem mounted in said extension extending above the head and below the valve, means on one end of said stem to support a resistant spring, an adjusting nut mounted on the upper end of said stem and adapted to interlock with the bushing to hold said stem against rotation, the portion of the stem within the dash-pot and tubular extension having a smooth bearing surface.

This specification signed and witnessed this 2nd day of April, A. D., 1913.

LEONARD V. FLECHTER.

Signed in the presence of M. P. \VINNE, M. J. Coornn. 

